Hi MBrannon
I'm afraid I can't comment on the K20D, but it has been my experience that when the K10D is switched to continuous AF mode, the internal mechanism of the camera goes into a kind of 'hyper-active' dithering routine. The electronics / optics seem to find great difficulty deciding precisely what to lock onto, whilst never entirely succeeding ! After much experimentation, I've settled on using centre focus mode in combination with single Auto Focus on the K10D and that seems to lead to far less 'hunting'. Admittedly I don't specialise in taking action or sports photography, so AF problems have never really bothered me much in this respect. Don't take this as absolute gospel, but I also understand that the contrast (or often lack thereof) of a given lens usually has a marked influence on how well it performs in conjunction with an AF system.
Best regards
Richard
Last edited by Confused; 04-07-2009 at 03:53 PM.